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Signals and PLC · Glossary

What is a Pulse Output?

frequency or pulse per unitSignals and PLC

A pulse output sends one pulse per fixed quantity of flow, or a frequency proportional to flow, for accurate totalising.

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Pulse Output Explained

The receiving counter or high speed input multiplies pulses by the pulse value. Frequency outputs scale a maximum frequency to maximum flow.

Pulse width and maximum frequency must suit the input; too fast pulses are missed by normal PLC inputs.

Pulse Output Formula

fmax = Qmax ÷ pulse value
Qmaxmaximum flow per second
pulse valuequantity per pulse
Example: 36 m³/h (0.01 m³/s) at 1 L per pulse: fmax = 10 Hz.
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Calculators for Pulse Output

CalculatorPulse Output Scaling CalculatorFree online calculator with formula and worked example.CalculatorK Factor CalculatorFree online calculator with formula and worked example.CalculatorEncoder RPM CalculatorFree online calculator with formula and worked example.

Frequently Asked Questions

What is a Pulse Output?

A pulse output sends one pulse per fixed quantity of flow, or a frequency proportional to flow, for accurate totalising.

Pulse or 4 to 20 mA for totals?

Pulses, because the current signal adds scaling and sampling errors.

What is an open collector output?

A transistor switch that needs an external supply and pull up resistor.

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